American Farmland Trust  
Goals include protecting farmland from urbanization and development, eliminating soil erosion, reducing agriculture's impact on the environment, and promoting farming practices that lead to a healthy environment.

Land Trust Alliance
The national umbrella organization of land trusts, the Alliance provides information on land trusts, conservation, conservation easements and other land protection tools.

Nature Serve
Gathers information on endangered plants, animals and ecosystems. Supplies this information to land-use planners, decision-makers, scientists and the public.  

Natural Resources Conservation Service (NRCS)
The Natural Resources Conservation Service's mission is to provide leadership in a partnership effort to help people conserve, improve, and sustain our natural resources and environment.  Their vision is to create harmony between people and the land.

The Nature Conservancy 
Among environmental organizations, The Nature Conservancy fills a unique niche: preserving plants, animals and natural communities that represent the diversity of life on earth by protecting the lands and waters they need in order to survive.

Trust for Public Lands 
The Trust for Public Land conserves land for people to enjoy as parks, gardens, and other natural places, ensuring livable communities for generations to come.